下面根据钱币的不同材质，简单介绍中国钱币的主要种类。
According to different material of the coin, and briefly introduces the main kinds of China's COINS.
主要介绍无粘结预应力钢绞线的原材质量控制、配料、张拉力值、伸长值的计算及施工工艺。
The paper mainly introduces raw material quality control, calculation of burden, stretch-draw force and elongation value, construction technology of non-bonding prestressed steel strand.
介绍了镇江新河桥的概况，并主要从桥梁结构造型、栏杆、材质、色彩、夜间照明等方面对该桥的景观美学设计进行了较为系统的阐述。
This paper introduced the general situation of Xinhe Bridge in Zhenjiang, and its aesthetic design in construction form, balustrade, texture, color and night lighting.
介绍食品保鲜膜的主要材质：聚乙烯（PE）、聚氯乙烯（PVC）、聚偏二氯乙烯（PVDC）；
What materials made up food wrapper: polyethylene(PE), polyvinyl chloride(PVC), poly(vinylidene dichloride)(PVDC);
指南的每个主要章节阐述了选择刀片、材质和刀体的方法，在开头部分还介绍了如何在书中查找信息。
The main sections each start with an explanation of how to use the booklet and how to choose an insert, grade and tool.
指南的每个主要章节阐述了选择刀片、材质和刀体的方法，在开头部分还介绍了如何在书中查找信息。
The main sections each start with an explanation of how to use the booklet and how to choose an insert, grade and tool.
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